Malicious PDF — malware analysis report

Static analysis result for SHA-256 5608f4209de419f3…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 21:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 712c66d05092e5fef7d2a9bfc22eaa8e SHA-1: 9fd0be6fe1fca91b821a2efbe965afea5c9b7bef SHA-256: 5608f4209de419f34eff7015a14d35f67b40a0cefb2133a6fb8e562d6eb87b0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to potentially compromised WordPress sites, indicating an attempt to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7673b8676d---30475965365.pdf
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/movarinogujo.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/gphk75nne7phj2atc0u11po80j/rejinobuvojewutomewup.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/0k983qcugd91rddjlvpjmj1kg3/50897812839.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3kqfllik899e0avkhit8rt2m03/53733679874.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/5b2a207cf5ec326f28627252c9d4bfc9/gijorubuzel.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b920687595---xakegemulujofemoxus.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a22bc4d4a4---88885535503.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/11813421d6c74fa9070d08ea75ebe4d1/digolotadimominujakuze.pdf
    • https://next-engineering.com/userfiles/files/lajexifawudizerorogeta.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b255e34a397---32238951667.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608836d4899a5---9392866124.pdf
    • http://solartgaleria.hu/images/file/pekokuxupilosesekajazajo.pdf
    • http://vswet.ru/f/tipupenidozininidolox.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/alv62kh58b0ju7l1i7jl5q8ccd/vorus.pdf
    • https://west-holding.com/userfiles/file/jesomivadolus.pdf
    • https://egyiksem.hu/uploads/file/57589532376.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608870db00b95---89535547371.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607399ac74652---23992283888.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8d9f181e---kutusidanek.pdf
    • http://www.oiseaubleu-promo.fr/userfiles/file/35379894845.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a6103e5480---xefopojadigopaxodoxabelik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+hyperpolarization
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 16792 bytes
font_01_sfnt_off00010803.bin
5c7e2210c8c777a4c5120d88e4b9774885a43108325b72b640e02d44ad719391
pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 10636 bytes
font_02_sfnt_off0001204a.bin
84894458c13dda397b3b01fb0dd8000024eef2bd14a04143fc50e45f777db35e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 16828 bytes